Closing plug for a container-installed flange



FIG. 1 is a top, front, and right side perspective view of a closing plug for a container-installed flange showing the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof; and,

FIG. 5 is a side elevation view thereof, with the opposite side appearing the same.

The portions of the design shown in broken lines form no part of the claim. 

CLAIM The ornamental design for a closing plug for a container-installed flange, as shown and described. 